~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 by Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Commit message editor support."""

import codecs

import errno

import os

from subprocess import call

import sys

import bzrlib

import bzrlib.config as config

from bzrlib.errors import BzrError

from bzrlib.trace import warning, mutter

def _get_editor():

    """Return a sequence of possible editor binaries for the current platform"""

    try:

        yield os.environ["BZR_EDITOR"]

    except KeyError:

        pass

    e = config.GlobalConfig().get_editor()

    if e is not None:

        yield e

    for varname in 'VISUAL', 'EDITOR':

        if os.environ.has_key(varname):

            yield os.environ[varname]

    if sys.platform == 'win32':

        for editor in 'wordpad.exe', 'notepad.exe':

            yield editor

    else:

        for editor in ['/usr/bin/editor', 'vi', 'pico', 'nano', 'joe']:

            yield editor

def _run_editor(filename):

    """Try to execute an editor to edit the commit message."""

    for e in _get_editor():

        edargs = e.split(' ')

        try:

            ## mutter("trying editor: %r", (edargs +[filename]))

            x = call(edargs + [filename])

        except OSError, e:

           # We're searching for an editor, so catch safe errors and continue

           if e.errno in (errno.ENOENT, ):

               continue

           raise

        if x == 0:

            return True

        elif x == 127:

            continue

        else:

            break

    raise BzrError("Could not start any editor.\nPlease specify one with:\n"

                   " - $BZR_EDITOR\n - editor=/some/path in %s\n - $EDITOR" % \

                    config.config_filename())

DEFAULT_IGNORE_LINE = "%(bar)s %(msg)s %(bar)s" % \

    { 'bar' : '-' * 14, 'msg' : 'This line and the following will be ignored' }

def edit_commit_message(infotext, ignoreline=DEFAULT_IGNORE_LINE):

    """Let the user edit a commit message in a temp file.

    This is run if they don't give a message or

    message-containing file on the command line.

    infotext:

        Text to be displayed at bottom of message for

        the user's reference; currently similar to

        'bzr status'.

    """

    import tempfile

    msgfilename = None

    try:

        tmp_fileno, msgfilename = tempfile.mkstemp(prefix='bzr_log.', dir=u'.')

        msgfile = os.close(tmp_fileno)

        if infotext is not None and infotext != "":

            hasinfo = True

            msgfile = file(msgfilename, "w")

            msgfile.write("\n\n%s\n\n%s" % (ignoreline,

                infotext.encode(bzrlib.user_encoding, 'replace')))

            msgfile.close()

        else:

            hasinfo = False

        if not _run_editor(msgfilename):

            return None

        started = False

        msg = []

        lastline, nlines = 0, 0

        for line in codecs.open(msgfilename, 'r', bzrlib.user_encoding):

            stripped_line = line.strip()

            # strip empty line before the log message starts

            if not started:

                if stripped_line != "":

                    started = True

                else:

                    continue

            # check for the ignore line only if there

            # is additional information at the end

            if hasinfo and stripped_line == ignoreline:

                break

            nlines += 1

            # keep track of the last line that had some content

            if stripped_line != "":

                lastline = nlines

            msg.append(line)

        if len(msg) == 0:

            return ""

        # delete empty lines at the end

        del msg[lastline:]

        # add a newline at the end, if needed

        if not msg[-1].endswith("\n"):

            return "%s%s" % ("".join(msg), "\n")

        else:

            return "".join(msg)

    finally:

        # delete the msg file in any case

        if msgfilename is not None:

            try:

                os.unlink(msgfilename)

            except IOError, e:

                warning("failed to unlink %s: %s; ignored", msgfilename, e)

def make_commit_message_template(working_tree, specific_files):

    """Prepare a template file for a commit into a branch.

    Returns a unicode string containing the template.

    """

    # TODO: Should probably be given the WorkingTree not the branch

    #

    # TODO: make provision for this to be overridden or modified by a hook

    #

    # TODO: Rather than running the status command, should prepare a draft of

    # the revision to be committed, then pause and ask the user to

    # confirm/write a message.

    from StringIO import StringIO       # must be unicode-safe

    from bzrlib.status import show_tree_status

    status_tmp = StringIO()

    show_tree_status(working_tree, specific_files=specific_files, 

                     to_file=status_tmp)

    return status_tmp.getvalue()